TS Optics apochromatic Barlow Lens 5x - 1.25 inch
For high magnifications, like for observing moon and planets, you need to use short focal length eyepieces. These are often either very expensive or have a very narrow eye relief, making them rather uncomfortable to use.
For astro-imaging with large magnifications you can do eyepiece projection, but this offers only a limited sharpness throughout the photographic field.
The TS Optics APO Barlow lens is the ideal alternative for both applications.
Fields of use
The large magnification factor 5x turns for example a 25 mm Plossl eyepiece into a 5 mm eyepiece, while retaining the comfortable eye relief of the longer eyepiece. This is very comfortable for observing planets.
For high magnification astro-imaging, like for webcam imaging of the planets, you could use eyepiece projection photography. The better alternative is the 5x Barlow lens because it offers a better field sharpness than typical eyepiece projections. Experience shows that for planetary imaging an effective focal ratio of f/25-f/30 is ideal. As a result this Barlow is the perfect match for most Newtonian telescopes.
The Lens Element
The three-element Barlow lens is fully multi-coated for a bright and high contrast image.
5x Apo Barlow Lens, 1.25"
plastic dustcaps on both sides
Short, apochromatic Barlow lens as an alternative to the use of eyepieces with short focal length for reaching high magnifications.